Physics Questions-Force-1

As shown in the image, a W weight is hanged to the xyz string's y point.If the system is in balance, then what is the tension of xy string? Select from the following:

1. wcos30
2. wcos60
3. wtan30
4. wtan60
5. wsin60

Physics Qyestion 10

Water of a river, that is 1000m wide and has parallel banks, flows towards north in a constant velocity of 2ms-1. A man rows a boat from a place in a bank with a constant velocity of 3ms-1 to the east, relative to the water.

1. What is the boat's velocity relative to earth?
2. When the boat reaches the next bank, what is the distant it has flowed down the river?
3. What is the time taken for the man to cross the river?

If the man wants to get to the point perpendicular to the point he starts rowing, with all the other vectors same as above,

1. What is the direction he has to row the boat?
2. Then, what is the boat's velocity relative to the earth?
3. What is the time taken for the man to reach the other bank of the river? 

Physics Question 9

In the image is the velocity time graph for a train moving between the station x and station y. The distances the train traveled in the time intervals t_1,t_2 and t_3 are respectively 3km, 11km and 2km. Find the maximum velocity of the train.

Physics Question 8

A particle is projected horizontally from the top of a building in a velocity of 15ms-1. It hits the ground 45m away from the bottom of the building.

1. What is the height of the building?
2. What is the angle it creates with the horizontal when it hits the ground? 

Physics Question 7

A particle projected from the ground travels a maximum height of 20m. It's horizontal range from the projecting point is 60m.

1. Find the projectile velocity and the projectile angle of the particle.
2. If the particle stays 15m of height from the ground at any two points, what is the horizontal range from between the two points? 

Physics Question 6

A little ball hanged by a string is made to oscillate. After that, when it passes the the lowest point it can pass in its motion the string is cut. If the ball moved in a height of 5m from the ground in a velocity of 0.8ms-1 at this moment,

1. What is the time that takes for the ball to fall on the ground?
2. What is the horizontal range passed by the ball?

Physics Question 5

A ball is projected in an angle of 30 degrees from the horizontal in a velocity of 320ms-1 upward.
Find,

1. The time taken for it to come to the maximum height,
2. The horizontal range that takes to come to the maximum height,
3. The maximum horizontal range that can be achieved with this velocity(The projectile angle is unknown),
4. To achieve this horizontal range, what is the angle the ball has to be projected.